I believe THC is still illegal in France.
So it's mostly convenience - a certain base of weed users don't want to buy from dealers, or want the security of a well produced product - an illicitly produced THC vape can be dangerous [1][2].
CBD (particularly the terpene infused ones) fill that gap.
Nearly all A&E (ER) rooms are managed by the NHS. Private ones are few and far between so it’s likely that a tourist with insurance will end up in a standard A&E - which can have very long wait times[1].
The NHS is also using private clinics to help clear backlogs - so even private insurance can lead to a long time to see a consultant.
This is it for me, I used Apple Music for a few years and eventually I noticed that some of my playlists would have tracks missing - sometimes a listing would be ghosted, sometimes it would straight up vanish. I called time, brought a A50 and haven't looked back: https://chanc.ee/posts/20200830-abandon-stream.html
Granted my music tastes are esoteric but silently modifying my playlists felt grievous. Now I make sure that subscription money goes on supporting artists directly.
CBD (particularly the terpene infused ones) fill that gap.
[1] https://www.independent.co.uk/news/health/vaping-cannabis-oi... [2] https://www.vice.com/en/article/xweejk/cannabis-vapes-pens-b...
Edit: Should also mention there's a market for the effects of weed, without the 'high'.